1. Faculty of Economics, University of Porto, CEF-UP, Porto, Portugal
2. Research on Economics, Management and Information Technologies, REMIT, Portucalense University, Porto, Portugal
3. CEOS.PP, ISCAP, Porto, Portugal
4. Escola Superior de Ciências Empresariais, Instituto Politécnico de Setúbal, Setúbal, Portugal
5. Nova School of Business and Economics, Carcavelos, Portugal